I don't know how long the Kalloy seat posts are
they are made in a number of diameters, and 22.2 at the top.
How long do you need for an extension, 12 inches above the frame perhaps?
I'd suggest a Redline /SBS 1" seatpost, its pretty darn long. [I used that on a old Mountain Bike and had a foot out of the frame]
it's an alloy : Chromium Molybdenum alloy steel. and then at the bottom of it .. get a 25.4 to 27.2 shim.
with that long a leverage under your backside I would not want to be atop a light seatpost.
an aside : you could get a thick wall piece of 7075T6 in 7/8" OD, to fit saddle clips at the top,
and then fit it with a machined shim to suit the ID of your frame...
20% of the length should be inside the frame..
Last edited by fietsbob; 12-15-10 at 05:02 PM.